Accrual: Definition and AP Meaning | Glossary

Glossary definition of accrual: what it is, how it works in AP, and why it matters for spotting margin drift before invoices reconcile against contract terms.

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Accrual: Definition and AP Meaning | Glossary

Accrual is the accounting entry that records an expense for goods or services already received but not yet invoiced, so the cost lands in the correct period instead of whichever period the vendor happens to bill. It is a routine month-end mechanic, but the estimate behind it is where a contract's actual terms first get tested against a number someone wrote down without checking a rate card.

1. How does an accrual get created?

An accrual is created at month-end close when a company has received goods or services but has not yet received the vendor's invoice. AP or the controller estimates the amount owed, usually from a purchase order, a contract rate, or the vendor's prior billing pattern, and books it as a liability so the expense lands in the period the work was actually done.

The estimate is a placeholder, not a verified charge. It is only ever as accurate as the source it was built from.

2. How does an accrual get reversed?

Once the real invoice arrives, the original estimated entry is reversed and the actual invoice amount is booked in its place. If the invoice matches the accrual, the reversal is clean. If it does not, the difference shows up as a variance in the current period rather than the period the cost was incurred in, which is where a wrong estimate can go unexamined.

A variance report flags the gap but does not explain it. Someone still has to check the invoice against a rate card, a volume tier, or a not-to-exceed cap to know whether the difference is a legitimate adjustment or drift.

3. Why does an accrual matter for spotting drift?

An accrual is a forecast of what an invoice should say, built before anyone has tested the invoice against the contract. When the eventual invoice is close enough to the accrual, the entry reverses quietly and the invoice itself is never checked line by line, which is exactly the condition margin drift needs to accumulate unnoticed.

A recurring accrual that tracks a stale rate teaches the ledger to expect the wrong number every month. That expectation is what lets an overbilled invoice pass close without a second look.

4. How is an accrual different from a payment?

An accrual is a bookkeeping estimate that changes when an expense is recognized on the income statement. A payment is the actual movement of cash, triggered later by an approved invoice. The two are related but separate events, and a company can carry an accrual for months before any cash is paid against it.

Confusing the two is common in smaller AP teams. Treating an accrual as if it were a settled charge is what lets an inflated estimate go unquestioned for an entire quarter.

For the wider pattern this sits inside, start with the margin drift guide.

5. Frequently Asked Questions (People Also Ask)

What is an accrual in accounts payable?

An accrual is an estimated liability recorded for goods or services received before the vendor invoice arrives. It lets a company recognize the expense in the correct period rather than waiting for the bill, and it is later reversed once the actual invoice posts.

Why do accruals matter for margin drift?

Margin drift is the gap between what a vendor contract says and what the invoice actually charges. An accrual is only an estimate of that invoice, so if the estimate is wrong or the eventual invoice is never checked against the rate card, the gap can pass through both close cycles unnoticed.

Is an accrual the same as a reserve?

No. A reserve sets aside funds for a possible future obligation that may or may not become an actual expense, such as a warranty claim. An accrual records an expense that has already been incurred, for work or goods already delivered, based on a known or estimated amount.

How is an accrual reversed?

When the actual vendor invoice posts, the AP team reverses the original estimated entry and records the real invoice amount. If the two figures differ, the difference flows through the current period's expense rather than the period the work was actually performed in.

Can an accrual hide a duplicate payment?

An accrual itself does not cause a duplicate payment, but a poorly reversed one can. If the estimated entry is not fully reversed when the real invoice posts, the ledger can carry both amounts, which looks like the expense was paid twice.

Who is responsible for setting the accrual amount?

Typically the controller or AP lead, working from a purchase order, a contract rate, or a vendor's historical billing pattern. The estimate is only as accurate as the reference it is built from, which is why an outdated rate card produces a consistently wrong accrual.

Does an accrual affect cash flow?

No. An accrual affects when an expense is recognized on the income statement, not when cash actually leaves the company. Cash moves only when the invoice is paid, regardless of which period the accrual assigned the expense to.

1. How does an accrual get created?

An accrual is created at month-end close when a company has received goods or services but has not yet received the vendor's invoice. AP or the controller estimates the amount owed, usually from a purchase order, a contract rate, or the vendor's prior billing pattern, and books it as a liability so the expense lands in the period the work was actually done. The estimate is a placeholder, not a verified charge. It is only ever as accurate as the source it was built from.

2. How does an accrual get reversed?

Once the real invoice arrives, the original estimated entry is reversed and the actual invoice amount is booked in its place. If the invoice matches the accrual, the reversal is clean. If it does not, the difference shows up as a variance in the current period rather than the period the cost was incurred in, which is where a wrong estimate can go unexamined. A variance report flags the gap but does not explain it. Someone still has to check the invoice against a rate card, a [volume tier](/glossary/volume-tier), or a not-to-exceed cap to know whether the difference is a legitimate adjustment or drift.

3. Why does an accrual matter for spotting drift?

An accrual is a forecast of what an invoice should say, built before anyone has tested the invoice against the contract. When the eventual invoice is close enough to the accrual, the entry reverses quietly and the invoice itself is never checked line by line, which is exactly the condition margin drift needs to accumulate unnoticed. A recurring accrual that tracks a stale rate teaches the ledger to expect the wrong number every month. That expectation is what lets an overbilled invoice pass close without a second look.

4. How is an accrual different from a payment?

An accrual is a bookkeeping estimate that changes when an expense is recognized on the income statement. A payment is the actual movement of cash, triggered later by an approved invoice. The two are related but separate events, and a company can carry an accrual for months before any cash is paid against it. Confusing the two is common in smaller AP teams. Treating an accrual as if it were a settled charge is what lets an inflated estimate go unquestioned for an entire quarter. For the wider pattern this sits inside, start with the [margin drift](/insights/margin-drift-spend-leakage-guide) guide.

Questions & Answers

What is an accrual in accounts payable?

An accrual is an estimated liability recorded for goods or services received before the vendor invoice arrives. It lets a company recognize the expense in the correct period rather than waiting for the bill, and it is later reversed once the actual invoice posts.

Why do accruals matter for margin drift?

Margin drift is the gap between what a vendor contract says and what the invoice actually charges. An accrual is only an estimate of that invoice, so if the estimate is wrong or the eventual invoice is never checked against the rate card, the gap can pass through both close cycles unnoticed.

Is an accrual the same as a reserve?

No. A reserve sets aside funds for a possible future obligation that may or may not become an actual expense, such as a warranty claim. An accrual records an expense that has already been incurred, for work or goods already delivered, based on a known or estimated amount.

How is an accrual reversed?

When the actual vendor invoice posts, the AP team reverses the original estimated entry and records the real invoice amount. If the two figures differ, the difference flows through the current period's expense rather than the period the work was actually performed in.

Can an accrual hide a duplicate payment?

An accrual itself does not cause a duplicate payment, but a poorly reversed one can. If the estimated entry is not fully reversed when the real invoice posts, the ledger can carry both amounts, which looks like the expense was paid twice.

Margin Drift Resources